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3x + 8 = x - 2
3x - x = -2 - 8
2x = - 10 /:2
x = - 5
Odpowiedź D
2)
Cegła - C
1 - 0,25 = 0,75
3 kg = 3/4
1 kg = 1/4
4 kg = 1
Odpowiedź : Cegła waży 4 kg.
3 kg = 3/4
1 kg = 1/4
4 kg = 1
Odp. B